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html {
  font-family: -apple-system, BlinkMacSystemFont, 
    "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", 
    "Fira Sans", "Droid Sans", "Helvetica Neue", 
    sans-serif;
}

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/* apply a natural box layout model to all elements, but allowing components to change */
html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}

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Here are the keyboard shortcuts to use in OS X:
Double Left Angle Quote («) – ALT \ (hold the ALT key and press the backward slash key)
Double Right Angle Quote (») – ALT SHIFT \ (hold the ALT and SHIFT keys, then press the backward slash key)

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

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#Simple Authentication with Bcrypt

This tutorial is for adding authentication to a vanilla Ruby on Rails app using Bcrypt and has_secure_password.

The steps below are based on Ryan Bates's approach from Railscast #250 Authentication from Scratch (revised).

You can see the final source code here: repo. I began with a stock rails app using rails new gif_vault

##Steps

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Rails naming conventions

General Ruby conventions

Class names are CamelCase.

Methods and variables are snake_case.

Methods with a ? suffix will return a boolean.

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Signing VirtualBox Kernel Modules

These are the steps I followed enable VirtualBox on my laptop without disabling UEFI Secure Boot. They're nearly identical to the process described on [Øyvind Stegard's blog][blog], save for a few key details. The images here are borrowed from the [Systemtap UEFI Secure Boot Wiki][systemtap].

1. Install the VirtualBox package (this might be different for your platform).

   src='https://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo'

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ORM mapping between OOP and relational database

Object-Oriented Programming	Relational Database
Class	Table
Instance of class (object)	Row
Name of instance property (e.g., 'username')	Column

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Sequelize operators and their SQL equivalents

Sequelize .Op operator	SQL Operator
[Op.eq]	=
[Op.and]	AND
[Op.or]	OR
[Op.not]	NOT
[Op.like]	LIKE
[Op.in]	IN

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npm init -y # Run this command if the project is new and you don't have a package.json              

npm install sequelize

npm install sqlite3 # This command will differ depending on what RBDMS you use